using System;
using System.IO;
using System.IO.Compression;
using System.Security.Cryptography;
using System.Xml;
using System.Xml.Serialization;
using Kreta.EESZTInterface.eFT.Model.AllomanyResz.Response;
using Kreta.EESZTInterface.eFT.Model.IntezmenyiAllomanyLista.Response;
using Kreta.EESZTInterface.eFT.Model.SikeresCimzettAllomanyLetoltes.Response;
using Kreta.EESZTInterface.STS;

namespace Kreta.EESZTInterface
{
    public class EFTHelper
    {
        private readonly string eftUrl;

        public EFTHelper(string eftUrl)
        {
            this.eftUrl = $"{eftUrl}/EFT/AllomanyPublikalo";
        }

        public GetIntezmenyiAllomanyListaResponse CallIntezmenyAllomanyLista(SamlAssertion samlAssertion, string clientUserId, string organizationId)
        {
            var bo = eFT.CreateSoap.GetIntezmenyiAllomanyListaBusinessObject(samlAssertion, clientUserId, organizationId);

            var xDoc = eFT.CreateSoap.CreateGetIntezmenyiAllomanyLista(samlAssertion.Original, bo);
            var (soapResponse, _) = eFT.DoRequest.GetSoapSamlResponse(eftUrl, CertificateHelper.GetSslCertificate(), xDoc, samlAssertion);
            var resp = (XmlElement)(soapResponse.GetElementsByTagName("getIntezmenyiAllomanyListaResponse", Namespaces.allomanyPublikaloServiceV1Ns).Item(0));
            return SerializeResponseContent<GetIntezmenyiAllomanyListaResponse>(resp);
        }

        public (GetAllomanyReszResponse response, byte[] attachment) CallAllomanyResz(SamlAssertion samlAssertion, string clientUserId, string organizationId, Guid publikusId, int sorszam)
        {
            var bo = eFT.CreateSoap.GetAllomanyReszBusinessObject(samlAssertion, clientUserId, organizationId, publikusId, sorszam);

            var xDoc = eFT.CreateSoap.CreateGetAllomanyresz(samlAssertion.Original, bo);
            var (soapResponse, mTOMAttachment) = eFT.DoRequest.GetSoapSamlResponse(eftUrl, CertificateHelper.GetSslCertificate(), xDoc, samlAssertion);
            var resp = (XmlElement)(soapResponse.GetElementsByTagName("getAllomanyReszResponse", Namespaces.allomanyPublikaloServiceV1Ns).Item(0));
            return (SerializeResponseContent<GetAllomanyReszResponse>(resp), mTOMAttachment);

        }

        public SikeresCimzettAllomanyLetoltesResponse CallSikeresAllomanyLetoltes(SamlAssertion samlAssertion, string clientUserId, string organizationId, Guid publikusId)
        {
            var bo = eFT.CreateSoap.GetSikeresCimzettAllomanyLetoltesBO(samlAssertion, clientUserId, organizationId, publikusId);

            var xDoc = eFT.CreateSoap.CreateSikeresLetoltes(samlAssertion.Original, bo);
            var (soapResponse, _) = eFT.DoRequest.GetSoapSamlResponse(eftUrl, CertificateHelper.GetSslCertificate(), xDoc, samlAssertion);
            var resp = (XmlElement)(soapResponse.GetElementsByTagName("sikeresCimzettAllomanyLetoltesResponse", Namespaces.allomanyPublikaloServiceV1Ns).Item(0));
            return SerializeResponseContent<SikeresCimzettAllomanyLetoltesResponse>(resp);
        }

        private T SerializeResponseContent<T>(XmlElement element)
        {
            var serializer = new XmlSerializer(typeof(T));

            using (TextReader reader = new StringReader(element.OuterXml))
            {
                return (T)serializer.Deserialize(reader);
            }
        }

        public static byte[] ComputeSha256Hash(byte[] reszadat)
        {
            using (var sha256Hash = SHA256.Create())
            {
                return sha256Hash.ComputeHash(reszadat);
            }
        }

        public static byte[] Decompress(byte[] input)
        {
            using (var source = new MemoryStream(input))
            {
                byte[] lengthBytes = new byte[4];
                source.Read(lengthBytes, 0, 4);

                var length = BitConverter.ToInt32(lengthBytes, 0);
                using (var decompressionStream = new GZipStream(source,
                    CompressionMode.Decompress))
                {
                    var result = new byte[length];
                    decompressionStream.Read(result, 0, length);
                    return result;
                }
            }
        }
    }
}